<?php

namespace addons\resources\utils;

class Resources {


    private function gmt_iso8601($time) {
        $dtStr = date("c", $time);
        $mydatetime = new \DateTime($dtStr);
        $expiration = $mydatetime->format(\DateTime::ISO8601);
        $pos = strpos($expiration, '+');
        $expiration = substr($expiration, 0, $pos);
        return $expiration."Z";
    }


    public function loadAccess($path = 'video/'){
        $data = config('aliyunoss');
        $id= $data['AccessKeyId'];
        $key= $data['AccessKeySecret'];
        $host = $data['host'];
        // $host的格式为 bucketname.endpoint，请替换为您的真实信息。
        // $callbackUrl为上传回调服务器的URL，请将下面的IP和Port配置为您自己的真实URL信息。
        $callbackUrl = $data['callbackUrl'];
        $dir = 'video/';          // 用户上传文件时指定的前缀。
        $callback_param = array('callbackUrl'=>$callbackUrl, 
            'callbackBody'=>'filename=${object}&size=${size}&mimeType=${mimeType}&height=${imageInfo.height}&width=${imageInfo.width}', 
            'callbackBodyType'=>"application/x-www-form-urlencoded");
        $callback_string = json_encode($callback_param);

        $base64_callback_body = base64_encode($callback_string);
        $now = time();
        $expire = 30;  //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问。
        $end = $now + $expire;
        $expiration = $this->gmt_iso8601($end);

        //最大文件大小.用户可以自己设置
        $condition = array(0=>'content-length-range', 1=>0, 2=>1048576000);
        $conditions[] = $condition; 

        // 表示用户上传的数据，必须是以$dir开始，不然上传会失败，这一步不是必须项，只是为了安全起见，防止用户通过policy上传到别人的目录。
        $start = array(0=>'starts-with', 1=>'$key', 2=>$dir);
        $conditions[] = $start; 

        $arr = array('expiration'=>$expiration,'conditions'=>$conditions);
        $policy = json_encode($arr);
        $base64_policy = base64_encode($policy);
        $string_to_sign = $base64_policy;
        $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true));

        $response = array();
        $response['accessid'] = $id;
        $response['host'] = $host;
        $response['policy'] = $base64_policy;
        $response['signature'] = $signature;
        $response['expire'] = $end;
        $response['callback'] = $base64_callback_body;
        $response['dir'] = $dir;  // 这个参数是设置用户上传文件时指定的前缀。
        return json_encode($response);
    }
    

}
